let all_processes: Vec<Process> = procfs::process::all_processes()
    .unwrap()
    .filter_map(|p| match p {
        Ok(p) => Some(p),                              // happy path
        Err(e) => match e {
            procfs::ProcError::NotFound(_) => None,    // process vanished during iteration
            procfs::ProcError::Io(e, path) => None,    // can match on path to decide if we can continue
            x => {
                panic!("Can't read process {x:?}");    // some unknown error
            }
        },
    })
    .collect();